Make middle click not mousedown close tabs

[Zachiah]

Closes #44856

Release Notes:

• Make a full middle click be required to close tabs not just a middle mousedown

[Zachiah]

This PR needs extensive testing. I hope I took the right approach. This is by far my most substantial PR to zed so far so please have grace 🙃. I wonder if the methods I added should be used in other places? I added on_right_click even though I didn't need it because it felt crazy to add on_middle_click but not on_right_click

[Zachiah]

I added on_right_click and on_middle_click instead of adding a first parameter to match the API of say on_mouse_down because I didn't want to make this a breaking change to gpui and have to update a billion places. If it is preferable to make a breaking change and add it as a first parameter just let me know and I will get working on that. My thought is that if we ever did want to do that we could change it to that from what it is currently fairly easily when we had other breaking changes say. I honestly don't know enough about how gpui is used and if it's fine to break it willy nilly to make the right call on my own.

[Anthony-Eid]

zed/crates/gpui/src/elements/div.rs

Line 2270 in a628d5d

if !click_listeners.is_empty() || drag_listener.is_some() {

You should add the new click listeners you added to this check

[Zachiah]

@Anthony-Eid Thanks for the helpful feedback and review. I updated it. Sorry about the force push. The sqlite db had conflicts for me locally so I rebased and that fixed it.